perf(BasicTree): 组件外部获取treeData不必通过treeDataRef.value或许更好些

[zwtvip]

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[wangjue666]

这样改后，传递值的时候就得传递 响应式对象，使用这个组件就会麻烦点

[zwtvip]

这样改后，传递值的时候就得传递 响应式对象，使用这个组件就会麻烦点

这样改还是可以正常拿到增删改查后的数据，内部本来就监听了，函数永远返回的最新值，不知道我这样理解对不

[wangjue666]

@zwtvip 抱歉是我看岔眼了， 我当时想的是gettreedata返回treeData的响应式数据，组件外面可以对他进行一些操作